Please help, it's a task in science and I'm really bad at this subject.

Answer:

0.74  g O

3

​

=

48

0.74

​

=0.0154 mol O

3

​

0.67 g NO=

30

0.67

​

=0.0223 mol NO

O

3

​

 is the limiting reagent and NO is in excess =0.0223−0.0154=0.007 mol

Thus, O

3

​

 taken =NO

2

​

 formed =0.0154 mol NO

2

​

                             =0.0154×46 g NO

2

​

Explanation:

Answer:

Bohr's model of hydrogen atom

I hope this answer is correct

Answer:

Bohr's

Explanation:

Answer:c

Explanation: A molecule is two atoms bonded together

Answer:

Explanation:

The Proton number for flourine will be 9

Then the mass number which will be protons+ neutrons will be 19

Argon which has a mass number of 40

to find the proton number of argon it will be 40-22=18

then the electron number will just be the same as proton number

then calcium the proton will be the same as electron so it will be 20

then neutrons will be mass number -proton number

which is 21

hope this helped

and pretty cool you use a mac

Answer:

It stays the same.

Explanation:

Answer:

the answer would be 9,448.8

The mass of 9.3 × 10¹⁶ lead atoms is equal to 0.032 mg.

Avogadro’s number represents the number of entities in one mole of any substance. Generally, these units can be molecules, atoms, ions, electrons, or protons, depending upon the type of chemical reaction or reactant and product.

The value of Avogadro’s constant is approximately equal to 6.022 × 10²³ mol⁻¹.

Given, the number of atoms of the lead =  9.3 × 10¹⁶

The atomic mass of the lead = 207.2 g/mol

So 6.022 × 10²³ atoms of lead have mass = 207.2g

Then 9.3 × 10¹⁶ lead atoms will have mass [tex]=\frac{207.2\times 9.3\times 10^{23}}{ 6.022\times 10^{23}}[/tex]  = 31.998 ×10⁻⁷g

As we know, 1 gram = 1000 mg

The mass of the  9.3 × 10¹⁶ lead atoms =  31.998 ×10⁻⁴ mg = 0.0032 mg

Therefore, the mass of 9.3 × 10¹⁶ lead atoms is  0.032 mg.

Learn more about Avogadro's number, here:

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Answer: Because They fall back to earth in the form of rain, sleet, hail, snow and dust. Most acid rain is caused by humans in the form of burning of fossil fuels. A very small percentage of acid rain is caused by natural causes such as volcanoes or wildfires.Human activities are the main cause of acid rain. Over the past few decades, humans have released so many different chemicals into the air that they have changed the mix of gases in the atmosphere. ... In addition, the exhaust from cars, trucks, and buses releases nitrogen oxides and sulfur dioxide into the air.

Explanation:

138 g SO₂

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[Given] 2.16 moles SO₂

[Solve] grams (mass) SO₂

Step 2: Identify Conversions

[PT] Molar Mass of S - 32.07 g/mol

[PT] Molar Mass of O - 16.00 g/mol

Molar Mass of SO₂ - 32.07 + 2(16.00) = 64.07 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

138.391 g SO₂ ≈ 138 g SO₂

Answer:

1.00 mol

Explanation:

Step 1: Given data

Molecules of water: 6.02 × 10²³ molecules

Step 2: Calculate the number of moles corresponding to 6.02 × 10²³ molecules of water

In order to convert molecules to moles, we need a conversion factor. In this case, we will use Avogadro's number: there are 6.02 × 10²³ molecules in 1 mole of molecules.

6.02 × 10²³ molecules × 1 mol/6.02 × 10²³ molecules = 1.00 mol (we keep 3 significant figures)

Answer:

Explanation:

b. rub past each other.

Answer:

When 2 plates collide

Explanation:

My mom is a science teacher

Answer:

Not exactly But you can take the slope of the curved portion and the slope of the flatline.

It wont do you much good since your working for absorbance but if you ever see something like a temperature change you can use the slope(s) to find freezing points/melting

Explanation:

If you need to submit a slope you could use a best fit which is just point to point or you could break it up like i mentioned

Answer:

683838447745 anmmlllkkkkk

Answer:

You eat a hamburger and breathe in oxygen.

Oxygen goes immediately from your lungs to blood vessels to cells.

Food molecules in the hamburger are broken down into glucose in the digestive system.

Explanation:

Answer:

1) food molecules enter receptors .....

2) The sensory receptors sends the message....

3) The message reaches the brain

4) the brain procces the information it recieved...

5) The brain stores the info  ...

6) The brain retrieves the info . ....

(I hope its clear ! I hope its right too ;) )

Answer:

1.31 × 10^47

Explanation:

1 mol of Fe =

[tex]1 \: mol \: of \ fe = 6.02 \times 10 ^{23} \ \\ x \: mol \: offe \: = 7.88 \times {10}^{24} \\ \\ \\ so \: 7.88 \times {10}^{24} \div 6.02 \times {10}^{23} \\ \\ x = 1.31 \times {10}^{47} [/tex]

Explanation:

sorry I really need the points in so sorry have a good day

Answer:

the same as

Explanation:

that's what makes the most since to me but i may be wrong

Answer:

53.6 g

Explanation:

Step 1: Write the balanced equation

2 Zn + Pb(SO₄)₂ ⇒ 2 ZnSO₄ + Pb

Step 2: Calculate the moles of ZnSO₄ produced from 0.332 moles of Zn

The molar ratio of Zn to ZnSO₄ is 2:2. The moles of ZnSO₄ produced are 2/2 × 0.0332 mol = 0.0332 mol.

Step 3: Calculate the mass corresponding to 0.332 moles of ZnSO₄

The molar mass of ZnSO₄ is 161.44 g/mol.

0.332 mol × 161.44 g/mol = 53.6 g

Answer:

It is liquid at most temperatures on Earth.

Answer: A) The amount of product measured after a reaction

A statement which best defines the actual yield of a reaction is "The amount of product measured after a reaction" Hence, Option (A) is correct

Yield of any chemical reaction gives idea about the amount of product that is produced by the chemical reaction between reactants.

Actual yield gives idea about the how much yield of any product will be produced in the given chemical reaction by using the stoichiometry of the reaction.

Therefore, A statement which best defines the actual yield of a reaction is "The amount of product measured after a reaction" Hence, Option (A) is correct

Learn more about yield here ;

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Answer:

B. is the answer

Explanation:

Energy in form of heat is transferred from the warmer mashed potatoes to the cooler spoon.

Answer:

It is liquid at most temperatures on Earth.

Answer:

SORFRRRRRRRRRRRRY!

Explanation:

Answer:

Neutral

Explanation:

U need to count the number of protons and electrons and see which has more...

Here the atom is neutral cause the electrons and protons are equal and cancell  each other out.

I hope im right!!

Answer:

To find the overall charge subtract electrons from protons

So in this example its 0

Explanation:

4 Protons

4 electrons

so basically

+4-4=0

Answer:

1 mass

2 matter

3 weight

4 molecule

5 compound

6 atom

Answer:

LOL

Explanation:

Explanation:

C electrical energy is converted into potential energy

Answer:

I can confirm it is, Potential energy is converted into kinetic energy.

Explanation:

Answer: The final concentration when 5 ml of a 2.5M copper sulphate solution is diluted to 750 ml is 0.017 M

Explanation:

According to the dilution law,

[tex]M_1V_1=M_2V_2[/tex]

where,  

[tex]M_1[/tex] = molarity of stock [tex]CuSO_4[/tex] solution = 2.5 M

[tex]V_1[/tex] = volume of stock [tex]CuSO_4[/tex]solution = 5 ml  

[tex]M_1[/tex] = molarity of diluted [tex]CuSO_4[/tex] solution = ?

[tex]V_1[/tex] = volume of diluted [tex]CuSO_4[/tex] solution = 750 ml

Putting in the values we get:

[tex]2.5\times 5=M_2\times 750[/tex]

[tex]M_2=0.017[/tex]

Therefore the final concentration when 5 ml of a 2.5M copper sulphate solution is diluted to 750 ml is 0.017 M